Dental tool sharpening device



Dec. 18, 1945.-' c. A. MILLER ET AL.

DENTAL TOOL SHARPENING DEVICE Filed March 2, '1945 Inventor Chan) ,4. Mil/cr- Samuel L. Bordzr Dec. 18, 1945. I

c. A. MILLER ETAL DENTAL TOOL SHARPENING DEVICE Filed March 2,,1945 3 Sheets-Sheet 3 Inventor Clad/7f A. Mil/(er Sarnue/ 11. Ecru (5r Patented Dec. 18, 1945 OFFICE DENTAL TOOL SHARPENING DEVICE Chant Miller, Winamac, andiSamuel L. f

Bordcr,Monon, Ind. f

' Application March 2,1945,'seria1 1vo.5so;ss4

' 2 Claims. (01. 51-59) The pre'sent invention relates to new and. usefulimproveni'ents in tool or instrument-holding and sharpening devices, and more particularly to adevice of this character for sharpening dental-instruments. 1 An important object of the present invention is to provide a dental tool-sharpening device of this character adapted for holding and sharpen ing various types of tools provided with com* paratively narrow cutting edges formed on the end of a shank'or handle, and embodying means for holding the tool 'or instrument at a proper angle with respect to a reciprocating sharpening stone. toefiect a proper sharpening thereof.

Afurther' object of the invention is to provide a sharpening device of and. practical construction, which is efficient and reliable in operation, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects'and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like reference numerals refer to like parts throughout, and in which:

Figure 1 is a top plan view,

this character of simple a carriage 14 are slidably mounted, the carriage being formed with a tray-like member lion its upper surfaceand adapted to receive a sharpening stone I6 mounted'in the tray and retained in position therein by means of a leaf spring}?! at one end of the tray, and in friction-gripping engagement with the adjacent endof'the stone.

From the bottom of the carrier 14 extends a pair of spaced apart apertured cars 18 having a piri lfl extending transversely thereof and to which the front end of the pitman rod is pivotally attached. h z

A pair of posts rise from the surface of the tableadjacent opposite sides thereof and in Figure 2 is a sectional view taken substantially on a line 2-2 of Figure 1,

Figure 3 is a side elevational view, Figure 4 is an end elevational view,

Figure 5 is a sectional view through the toolholding arm taken substantially on a line 5-5 of Figure 2, and k Figure 6 is a sectional view taken substantially on a line 6-6 of Figure 4.

Referring now to the drawings in detail wherein, for the purpose of illustration, we have disclosed a preferred embodiment of the invention, the numeral 5 designates a supporting stand or table having an opening 6 in the upper surface adj acent'one end thereof.

Extending downwardly from the edges of the opening is a hanger bracket 1 of substantially U-shaped construction and in the opposite sides of which is journaled a shaft 8 having one end projecting outwardly through a side of the table '5 and provided with a crank handle 9. The 0pposite end'of the shaft 8 is also formed with a crank l0, to which one end of a pitman arm II is pivotally attached.

The upper surface of the table 5 is also formed with a longitudinally extending opening 1 2, to the opposite sides of which are secured longitudinally extending guide tracks l3 in which the edges of which isjournaled the ends of a rock shaft 2|, the shaft extending transversely of the table "in spaced relation above the same.

A split collar 22 is secured. to the shaft 'by means of a screw or the'like 2-3, the collar hay-- ing a socket 24 therein in which is secured one end of a tool arm 25 extending longitudinally of the table.

The front end of the tool arm 25 is inserted in the rear end of a tube 21 of a tool holder 29.

The tube 2! is formed with longitudinally extending slots 30 to provide a plurality of frictiongripping fingers 3| which are secured in frictiongripping relation with the tool arm 25 by means of a taper threaded nut 32 threaded on the split end of tube 21, as will be apparent from an inspection of Figure 2 of the drawings.

The tool holder 29 includes a cylindrical member 33, to which the tube 21 is secured and having a nut 34 threaded thereon forming a socket for a ball 35. A coil spring 36 is positioned in the cylinder 33 behind a bearing block 31 engaging the ball 35 for frictionally holding the ball in engagement in the socket 34.

A stem 38 projects radially from the ball 35 into a tool-holding block 39 having right angularly disposed openings 40 extending therethrough, and in either of which a dental tool or instrument 40a may be secured by means of set screws 4| so that the cutting edge of the tool secured to the shaft 8.

Accordingly, in the operation of the device, the handle 9 is operated to rotate the shaft 8 whereby the sharpening stone I6 is reciprocated through its connection with said shaft by means of the crank 10 and pitman H.

At the same time, the rocker arm 43 is rocked back and forth by means of the cam 45 to rock the shaft 21 through the arm 42. The rocking motion of the shaft 2! causes a raising and lowering movement of the tool arm 25 whereby to raise and lower the tool carried by the block 39 into and out of engagement with the upper surface of the sharpening stone l 6. I

The raising and lowering movement of the tool arm 25 is timed so that the tool is held out of engagement with the sharpening stone during movement of the latter in one direction.

It will be apparent that the tool-holding block 39 may be moved into a desired position of adjustment by means of the ball and sockets34 and 35 so that the tool may be held at a desired angle for properly sharpening the cutting edge thereof. The block 39 is secured in its adjusted position by threading the socket 34 on the cylinder 33 to place the spring 36 under roper tension.

From the foregoing, it is obvious that we have provided a comparatively simple tool-sharpening device which will be inexpensive to construct and operate, and adapted for sharpening various types of dental and other types of tools and instruments.

While we have herein shown and described a preferred embodiment of our invention, it will be apparent that the same is susceptible to certain changes and modifications without departing from the spirit of the invention or the scope of the appended claims.

downwardly and rests on a cam or eccentric 45 Having thus described the invention, what we claim is:

1. A tool sharpener comprising a reciprocably mounted sharpening stone, means for reciprocably actuating the stone and including a rotatable shaft, a rock shaft, means for actuating the rock shaft by operation of the rotatableshaft, and a tool holding arm attached to the rock shaft for raising the arm during movement of the stone in one direction, said arm including a swivelly mounted tool holder adapted for holding a tool in a predetermined universally adjustable posi- "tion above the stone, and said arm gravitating into a position for contacting the tool with the stone upon movement of the stone in an opposite direction.

2. A tool sharpener comprising a support, a sharpening stone slidably mounted on the support, a rotatable shaft journaled in the support and operatively connected to the stone for reciprocably actuating the stone, a rock shaft journaled on the support, an arm secured to the rock shaft, a trip arm pivoted on the support with one end engaging the first-named arm, a cam carried by the rotatable shaft for actuating the trip arm to rock said rock shaft, a tool-holding arm secured to the rock shaft for raising and lowering movement in accordance with the actuation of the rock shaft, a tool-holding member adapted for holding a tool to be sharpened, a ball and socket connection between the tool-holding member and thetool-holding arm, and means for securing the ball in a predetermined adjusted position in the socket for supporting the tool in a desired angularly disposed position relative to the stone. H v v CHANT A. MILLER,

SAMUEL L. BORDER. 

